Eodolphe bekthon



06b1, 1929. BERTHQN v 1,729,922

FILMF'OR COLOR PHOTOGRAPHY Filed June 17, 1927 HocZoZp/Le Ber-[Lon Patented Oct. 1, 1929 I UNITED- sTATEs PATENT OFFICE BODOLPHE BEB'IHON, OI NEUILLY, FRANCE, ASSIGNOR, 'IBY MESNE ASSIGNMENTS, TO SQCIETE FRANCAISE CINECHROHATIQUE (PBQCEDES R. IBERTHON), OF PARIS,

FRANCE, a conrona'rron or rnancn I w 111.11 ron COLOR rn'orroeaarmz f Application filed June 17, 1927, Serial No.,199,558, and in France May 6, 1927.

Hitherto proposed films on plates provided with microscopic retracting elementsare composedof, at a minimum, two layers or coatings, one of which, the one whereon 5 the elements are formed, is entirely transparent and has a thickness corresponding to the focal distance of the retracting elements, while the other layer or coating, which may be opaque, consists of a gelatinosilver bromid emulsion.

When the light-sensitive substance used I (bichromates, mixtures, of azo and diazos compounds, etc.) is perfectly transparent and is further characterized by the fact that,

on being exposed under a positive, it produces a second positive, it becomes. possible to form the film or the plate). of a single layer the massv or ody of which is im regnated with the sensitizing substance, an this go is what constitutes the essential feature of the present invention.

Inthe accompanying drawing, Figure 1 Y is a diagram showing one way in which the invention can be carried out, and Fig. 2 is 25 an enlarged sectional view of a fragment of Referring to Fig. 1, A indicatesthe film 4 proper, the retracting elements a-a of which face towards filter B which is designed an toanalyze the colors of the radiations passing through the camera. 'Filter B will comrise, for instance, three zones: R (red), (green) and I indigo violet), and it will be assumed'that t efilm A is composed of d bichromated gelatine. On exposure to lig t, radiations from say, the red zone will be refracted on each oi theelements H and then will pass through the la. er, while converging more and more. -Sai radiations, in passing through the layer, render impervious all the arts touched by light so that such parts w no longer be capable .of'absorbmg a coloring material 'in the subse- 0' layer will begin-from the retracting elements dipedinto,

- tion indexes.

- quent treatment. Impermeability .of the v and willspread throu'ghthe layer 7 while following exactly the zone of convera black coloring agent whic is only not penetrate at all through the facethat :carries the elements Per. contra, it will penetrate through all the parts not affected by the convergent rays which "passed through the elements aa (such parts being shown as cross-hatched).- In this manner there will be obtained a positive of the red ence-either of an alkaline bath or of ammoniacal vapours.

Such films (or plates) are naturally suit-- able for use with printing apparatus or devices designed for gofiered film reproduction, and it is well known that in those devices trichrome filters are generally done away with, since the originals transmit under different angles the radiations corresponding to the colors registered during pic ture taking. 5. The same characteristic'is equally applicable to the production of films wherein the retracting elements are included between two layers of substances having difierent refrac- Figure 2. illustrates the colloid-gelatine example. A is a celluloid backing carry 'ing, 'gofi'ered in relief,- a multitude of fine 'refractin'g elements; B is a layer of bichromatedgelatine. I The film is exposed with the celluloid turned towards the source of light; the converging rays pass through the one represented by Figure l-and development of the I claim as my invention: 1. A film 'for color photography, reticulated on one face and. consisting of a single gelatine layer in a manner identical with the layer. of material the body or mass of which is imgregnated with a sensitizing agent.

2. film for color photography, reticulated on one .face andoonsisting of a single layer of material the body or mass of which is impregnated with a sensitizing mixture gf [111161111018 and diazo compounds destructible y ig t.

In testimony whereof I afiix my signature.

RODOLPHE BERTHON. 

